Patents by Inventor Tutomu Naganuma

Tutomu Naganuma has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Bipolar membrane
    Patent number: 5401408
    Abstract: A bipolar membrane comprising a cation exchange membrane, an anion exchange membrane and an inorganic ion exchanger layer having a thickness of from 0.01 to 100 .mu.m present at the interface between the cation exchange membrane and the anion exchange membrane.
    Type: Grant
    Filed: December 3, 1993
    Date of Patent: March 28, 1995
    Assignee: Asahi Glass Company Ltd.
    Inventors: Kazuo Umemura, Tutomu Naganuma, Haruhisa Miyake